/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2016-2024 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "volFields.H"
#include "randomGenerator.H"

// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

template<class Type>
bool Foam::functionObjects::randomise::calcRandomised()
{
    if (foundObject<VolField<Type>>(fieldName_))
    {
        const VolField<Type>& field = lookupObject<VolField<Type>>(fieldName_);

        tmp<VolField<Type>> rfieldt(new VolField<Type>(field));
        VolField<Type>& rfield = rfieldt.ref();

        randomGenerator rndGen(1234567);

        forAll(field, celli)
        {
            Type rndPert = rndGen.sample01<Type>();
            rndPert = 2.0*rndPert - pTraits<Type>::one;
            rndPert /= mag(rndPert);
            rfield[celli] += magPerturbation_*rndPert;
        }

        store(resultName_, rfieldt);

        return true;
    }
    else
    {
        return false;
    }
}


// ************************************************************************* //
